I have been using 1.6.0 up to this afternoon when I got notice that 1.6.1 was ready. I downloaded it and installed it, Windows 7 Pro 64bit, and when it is opened the screen doesn't refresh right. If I open another window on top, it stays on the IDE until I move it. Also opening an existing sketch comes up yellow as if I highlighted it, to clear it you have to scroll up or down. Seems there is a problem with the windows draw routines or something.
I have removed it and gone back to 1.6.0